A semi-encapsulated oil seal injection mold

Abstract

The utility model relates to oil seal injection mold technical field, concretely relates to a half encapsulation oil seal injection mold. Including vulcanization mould, the vulcanization mould includes upper die, middle die and lower die, the inboard of upper die is provided with the upper die core of upper die interference fit, the inboard of lower die is provided with the lower die core of lower die gap fit, the inboard of lower die core is provided with the lower core of lower die core gap fit. The space of upper die core, upper die, lower die core and lower die enclose constitutes encapsulation cavity. The space of upper die, middle die and lower die enclose constitutes the skeleton cavity of communication with encapsulation cavity, and oil seal skeleton is arranged in skeleton cavity, and oil seal skeleton includes skeleton outside and skeleton inside from top to bottom, and skeleton inside is provided with skeleton inside bending portion, and the one side of the lower end of upper die and skeleton inside bending portion contact is arranged as upper die lower end wedge shape part, and upper die lower end wedge shape part and skeleton inside bending portion interference fit. The utility model glue stop is stable, and product appearance is neat, and vulcanization efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of oil seal injection mold technology, specifically to a semi-encapsulated oil seal injection mold. Background Technology

[0002] Oil seals are common mechanical seals, primarily used to seal the lubricating oil inside a rotating shaft cavity while preventing the intrusion of external contaminants such as dust and mud. Based on the rubber coverage, they can be divided into semi-rubber-covered oil seals and fully rubber-covered oil seals. Semi-rubber-covered oil seals combine the advantages of fully rubber-covered oil seals, such as reliable sealing with the cavity and easy installation, while also offering benefits like resistance to detachment and tilting, and good thermal conductivity between the seal and the cavity.

[0003] Current production of semi-encapsulated oil seals utilizes injection molding, employing an external diameter sealing method. This method involves a direct interference fit between the oil seal's outer diameter and the mold to prevent glue leakage. Oil seals produced using this method often suffer from unstable glue sealing, ejection jamming, easy scratching of the seal's outer diameter, and low production efficiency. Furthermore, the existing semi-encapsulated oil seal production process requires waiting for the part to be removed before proceeding to the next vulcanization step, preventing simultaneous processing and further reducing efficiency.

[0004] Therefore, it is necessary to improve the existing semi-encapsulated oil seal injection mold. Summary of the Invention

[0005] To address the problems of unstable sealing, ejection jamming, easy scratching of the oil seal outer diameter, and low production efficiency in existing injection molds, this utility model provides a semi-encapsulated oil seal injection mold that relies on the interference fit between the upper mold cavity and the skeleton to compress and deform the skeleton, and the outer side of the skeleton forms an interference sealing with the middle mold.

[0006] The technical solution of this utility model is as follows:

[0007] A semi-overmolded oil seal injection mold includes a vulcanizing mold, which comprises an upper mold, a middle mold, and a lower mold. An upper mold core with an interference fit is provided on the inner side of the upper mold. A lower mold core with a clearance fit is provided on the inner side of the lower mold. A lower mold core with a clearance fit is provided on the inner side of the lower mold core. The space enclosed by the upper mold core, the upper mold, the lower mold core, and the lower mold constitutes an overmolded cavity. An injection hole is provided at the center of the upper mold core. The space enclosed by the upper mold, the middle mold, and the lower mold constitutes a skeleton cavity. The overmolded cavity and the skeleton cavity are connected and constitute the entire product cavity. The oil seal skeleton is disposed within the skeleton cavity. The skeleton includes an outer skeleton and an inner skeleton from top to bottom. An inner skeleton bend is provided on the inner skeleton. The lower end of the upper mold, which contacts the inner skeleton bend, is wedge-shaped and has an interference fit with the inner skeleton bend.

[0008] Furthermore, the interference fit between the upper mold and the upper mold core is 0.03-0.05mm.

[0009] Furthermore, the gap between the lower mold and the lower mold core is 0.06-0.1mm.

[0010] Furthermore, the interference fit between the lower end of the upper mold and the inner bending point of the skeleton is 0.05-0.07mm.

[0011] Furthermore, the wedge-shaped portion at the lower end of the upper mold contacts the inner bend of the skeleton to form an inner anti-adhesion surface. The angle of the wedge-shaped portion at the lower end of the upper mold is 20°, and the length is 3.3-3.5mm.

[0012] Furthermore, the upper mold, middle mold, and lower mold are respectively fixed in the mold cavity mounting holes on the upper template, middle template, and lower template by elastic retaining rings.

[0013] Furthermore, the bottom of the lower template is provided with a lower base plate, and the lower base plate is provided with an air intake mechanism.

[0014] Furthermore, the air intake mechanism includes a spring, an air intake top block, and bolts. The bolts are located on both sides of the air intake top block, and the spring is located in the middle of the air intake top block. The top of the air intake top block corresponds to the bottom of the lower core.

[0015] Furthermore, it also includes an ejection mechanism, which is located at the lower end of the vulcanizing mold and cooperates with the vulcanizing mold to eject the half-coated rubber oil in the vulcanizing mold. The ejection mechanism is provided with a middle template II, and the middle template II is provided with a middle mold II corresponding to the position of the middle mold I.

[0016] Furthermore, the ejection mechanism includes an ejection plate, a guide plate, an ejection block, and a guide rod. The guide plate is disposed at the upper end of the ejection plate, the middle mold plate II is disposed at the upper end of the guide plate, the guide rod passes through the ejection plate, the guide plate, and the middle mold plate II, the ejection block is disposed at the top end of the guide rod, and the middle mold plate II is disposed at intervals around the ejection block.

[0017] The beneficial effects achieved by this utility model are as follows:

[0018] 1. After the mold of this utility model is closed, the wedge-shaped part at the lower end of the upper mold and the inner bending part of the skeleton are interference-fitted. The horizontal component force causes the skeleton to deform outward, and the skeleton and the inner side of the middle mold are pressed tightly together, increasing the contact pressure and ensuring that the product cavity is sealed outside the skeleton. When the mold is opened after vulcanization, the wedge-shaped part at the lower end of the upper mold is lifted upward, the elastic deformation of the outer diameter of the skeleton is restored, and the contact pressure between the outer side of the skeleton and the inner side of the middle mold is reduced. At this time, the ejector block can eject the product from the lower end of the product cavity, ensuring that the outer diameter of the skeleton will not have defects such as scratches. Compared with the existing direct outer diameter interference sealing mold, this injection mold has the advantages of stable sealing, clean product appearance, and high vulcanization efficiency. In addition, the mold cavity of this mold is interchangeable. When producing semi-encased rubber skeleton oil seals of similar size, only the corresponding mold cavity needs to be replaced for production. This patent significantly improves the production efficiency of semi-encased rubber oil seals and improves the problems of unstable production of semi-encased rubber oil seals, easy overflow, defects and scratches on the outer diameter sealing part.

[0019] 2. This utility model, through the setting of two sets of intermediate molds and intermediate templates, can simultaneously realize the vulcanization of the product and the removal of the product, thereby improving the production efficiency of the product. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the mold cavity structure of this utility model.

[0021] Figure 2 yes Figure 1 Enlarged view of section A.

[0022] Figure 3 This is a schematic diagram of the vulcanizing mold structure in this utility model.

[0023] Figure 4 This is a schematic diagram of the ejection mechanism in this utility model.

[0024] In the diagram: 1. Upper mold core; 2. Upper mold; 3. Elastic retaining ring for the hole; 4. Middle mold I; 5. Upper template; 6. Middle template I; 7. Lower template; 8. Lower base plate; 9. Lower mold; 10. Injection hole; 11. Lower core; 12. Lower mold core; 13. Overmolded cavity; 14. Oil seal skeleton; 15. Bolt; 16. Air inlet ejector block; 17. Spring; 18. Guide pillar; 19. Guide pillar hole; 20. Semi-overmolded oil seal; 21. Ejector block; 22. Middle mold II; 23. Ejector plate; 24. Guide rod; 25. Guide rod bolt; 26. Middle template II; 27. Guide plate; 28. Ejector plate guide pillar; 29. ​​Wedge-shaped part at the lower end of the upper mold; 30. Inner bend of the skeleton; 31. Outer side of the skeleton; 32. Inner side of the middle mold; 33. Oil seal secondary lip; 34. Elastic retaining ring for the shaft. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate preferred embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] like Figures 1-4 As shown, a semi-coated oil seal injection mold includes a vulcanizing mold, an air inlet mechanism, and an ejection structure. The air inlet mechanism is located at the bottom of the vulcanizing mold and is used to allow air to enter the product cavity to prevent the oil seal secondary lip 33 from being unable to be removed and causing the oil seal secondary lip 33 to tear. The ejection structure is located at the lower end of the vulcanizing mold and cooperates with the vulcanizing mold to eject the semi-coated oil seal from the vulcanizing mold.

[0033] Mold cavity structure such as Figure 1 and 2 As shown, the system comprises three main parts: upper, middle, and lower. The upper mold core 1 and upper mold 2 have an interference fit with a clearance of 0.05mm, and the upper mold core 1 has an injection hole 10 in the center. The middle mold 4 has a small clearance fit with the upper mold 2 and lower mold 9, with a clearance of 0.02mm. The lower mold 9 has a lower mold core 12 and a lower core 11 on its inner side. There is a clearance of 0.1mm between the lower mold 9 and the lower mold core 12, and between the lower mold core 12 and the lower core 11, allowing for axial movement. The lower mold core 12 and the lower core 11 have elastic retaining rings 34 at their bottom for axial positioning and to prevent them from dislodging. The space enclosed by the upper mold core 1, upper mold 2, lower mold core 12, and lower mold 9 constitutes a rubber-coated cavity 13, with an injection hole 10 located at the center of the upper mold core 1. The space enclosed by the upper mold 2, middle mold 4, and lower mold 9 constitutes a skeleton cavity. The skeleton cavity is connected to the overmolding cavity 13, forming the entire product cavity. The oil seal skeleton 14 is set inside the skeleton cavity. The oil seal skeleton 14 includes an outer skeleton 31 and an inner skeleton from top to bottom. The inner skeleton is provided with an inner skeleton bend 30. The lower end of the upper mold 2 is in contact with the inner skeleton bend 30 and is set as the lower wedge-shaped part 29 of the upper mold. The lower wedge-shaped part 29 of the upper mold and the inner skeleton bend 30 are interference fit.

[0034] The vulcanizing mold, such as Figure 3 As shown, the mold consists of three main parts: the mold cavity, the mold plate, and the air intake mechanism. The upper mold 2, the middle mold 4, and the lower mold 9 are fixed to the upper mold plate 5, the middle mold plate 6, and the lower mold plate 7, which are spaced apart and used to install the mold cavity, respectively, via holes and elastic retaining rings 3. The upper mold plate 5 has guide pillars 18, and the middle mold plate 2 and the upper mold plate 3 have matching guide pillar holes 19. The guide pillars 18 and guide pillar holes 19 have a fitting clearance of 0.01mm, allowing the upper mold plate 5, the middle mold plate 2, and the upper mold plate 3 to move along the direction of the guide pillars 18. The lower mold plate 4 has a lower base plate 8 at its lower end, which is fixedly connected to the lower mold plate 4 by bolts. The lower base plate 8 has an air intake mechanism consisting of bolts 15, an air intake ejector block 16, and a spring 17. During mold opening, the air intake ejector block 16, driven by the spring 17, pushes the lower core 12 upwards, allowing air to enter the product cavity and preventing the oil seal lip 33 from being unable to be removed, thus preventing tearing of the oil seal lip 33.

[0035] Ejector structure such as Figure 4 As shown, the assembly includes the middle mold II and the middle template II, as well as the ejection mechanism. The ejection mechanism includes an ejection plate 23, a guide rod 24, a guide rod bolt 25, and a guide plate 27. The ejection block 21 is bolted to the guide rod 24 and the ejection plate 23 via the guide rod bolt 25. The ejection plate 23 and the guide plate 27 are clearance-fitted, and the ejection plate guide post 28 and the guide post hole 18 are clearance-fitted. The ejection plate 23 moves vertically, driving the ejection block 21 to eject the semi-encapsulated oil seal from the middle mold 22.

[0036] During the vulcanization production of this utility model mold, the upper mold plate 5, the middle mold plate 16, and the lower mold plate 7 respectively drive the upper mold 2, the middle mold 14, and the lower mold 9 to complete the mold closing. At this time, under the mold closing pressure of the vulcanizing equipment, the wedge-shaped part 29 at the lower end of the upper mold and the inner bending part 30 of the skeleton are interference-fitted. The wedge-shaped part 29 at the lower end of the upper mold and the inner bending part 30 of the skeleton contact to form an inner stop surface. The angle of the wedge-shaped part 29 at the lower end of the upper mold is 20° and the length is 3.5mm. The horizontal component force generated by extrusion causes the skeleton to deform outward. The outer side 31 of the skeleton and the inner side 32 of the middle mold are pressed tightly together with interference, and the contact pressure at this point increases. Then, the rubber material enters the product cavity from the injection port 10, filling the entire product cavity, and stops the glue at the outer side 31 of the skeleton. Therefore, the outer skeleton part of the semi-encapsulated rubber seal is exposed and not covered with rubber.

[0037] Synchronously, the intermediate mold II 22 and intermediate mold plate II 26, which participated in vulcanization in the previous production cycle, reach the ejection and part removal station under the drive of the injection molding machine's traction mechanism. The intermediate mold plate II 26 moves downward, and the guide post hole 19 cooperates with the guide post 18 to guide the mold. Then, the ejector plate 23 moves upward, driving the guide rod 24 and ejector block 21 to eject the semi-coated oil seal 20 from the intermediate mold II 22. The operator removes the semi-coated oil seal 20. Then, the ejector plate 23 moves downward, driving the guide rod 24 and ejector block 21 back to their original positions. Then, the operator puts the skeleton into the intermediate mold II 22. Because the bottom of the ejector plate 23 is equipped with a heating plate, the oil seal skeleton 14 can be preheated at this time. After the vulcanization process is completed, the intermediate mold I 4 and intermediate template I 6 are driven by the injection molding machine traction mechanism to reach the ejection and part removal station. The intermediate mold II 22 and intermediate template II 26 are driven by the injection molding machine traction mechanism to reach the vulcanization station. The two sets of intermediate molds and intermediate templates then exchange functions, and production enters the next cycle.

[0038] This utility model's mold cavity structure is interchangeable. Two sets of intermediate molds and intermediate templates can simultaneously complete the product vulcanization, ejection, and part removal processes, resulting in high production efficiency. The production process is stable and reliable, and exposed parts of the skeleton are less prone to glue overflow, defects, scratches, and other problems. It meets the needs of large-scale, high-efficiency production of semi-encapsulated oil seals.

[0039] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A semi-overmolded oil seal injection mold, characterized in that: The system includes a vulcanizing mold, comprising an upper mold (2), a middle mold (4), and a lower mold (9). The upper mold (2) has an upper mold core (1) that is interference-fitted with it on its inner side. The lower mold (9) has a lower mold core (12) that is clearance-fitted with it on its inner side. The lower mold core (12) also has a lower core (11) that is clearance-fitted with it on its inner side. The space formed by the upper mold core (1), the upper mold (2), the lower mold core (12), and the lower mold (9) constitutes a rubber-coating cavity (13). An injection hole (10) is located at the center of the upper mold core (1). The space enclosed by the upper mold (2), the middle mold I (4) and the lower mold (9) constitutes a skeleton cavity. The skeleton cavity is connected to the overmolding cavity (13) to form the entire product cavity. The oil seal skeleton (14) is set in the skeleton cavity. The oil seal skeleton (14) includes the outer side (31) and the inner side of the skeleton from top to bottom. The inner side of the skeleton is provided with an inner bending part (30). The side of the lower end of the upper mold (2) that contacts the inner bending part (30) of the skeleton is set as the lower wedge part (29) of the upper mold. The lower wedge part (29) of the upper mold and the inner bending part (30) of the skeleton are interference fit.

2. The semi-overmolded oil seal injection mold according to claim 1, characterized in that: The interference fit between the upper mold (2) and the upper mold core (1) is 0.03-0.05mm.

3. The semi-overmolded oil seal injection mold according to claim 1, characterized in that: The gap between the lower mold (9) and the lower mold core (12) is 0.06-0.1mm.

4. The semi-overmolded oil seal injection mold according to claim 1, characterized in that: The interference fit between the wedge-shaped part (29) at the lower end of the upper mold and the bend (30) on the inner side of the skeleton is 0.05-0.07 mm.

5. The semi-overmolded oil seal injection mold according to claim 1, characterized in that: The wedge-shaped part (29) at the lower end of the upper mold contacts the inner bend (30) of the skeleton to form an inner anti-adhesion surface, and the angle of the wedge-shaped part (29) at the lower end of the upper mold is 20°.

6. The semi-overmolded oil seal injection mold according to claim 1, characterized in that: The upper mold (2), middle mold I (4) and lower mold (9) are respectively fixed in the mold cavity mounting holes on the upper template (5), middle template I (6) and lower template (7) by elastic retaining rings (3).

7. A semi-overmolded oil seal injection mold according to claim 6, characterized in that: The bottom of the lower template (7) is provided with a lower base plate (8), and the lower base plate (8) is provided with an air intake mechanism.

8. The semi-overmolded oil seal injection mold according to claim 7, characterized in that: The air intake mechanism includes a spring (17), an air intake top block (16), and a bolt (15). The bolt (15) is located on both sides of the air intake top block (16), and the spring (17) is located in the middle of the air intake top block (16). The top of the air intake top block (16) corresponds to the bottom of the lower core (11).

9. A semi-overmolded oil seal injection mold according to claim 1, characterized in that: It also includes an ejection mechanism, which is located at the lower end of the vulcanizing mold and cooperates with the vulcanizing mold to eject the half-coated rubber oil in the vulcanizing mold. The ejection mechanism is provided with a middle template II (26), and the middle template II (26) is provided with a middle mold II (22) corresponding to the position of the middle mold I (4).

10. A semi-overmolded oil seal injection mold according to claim 9, characterized in that: The ejection mechanism includes an ejection plate (23), a guide plate (27), an ejection block (21), and a guide rod (24). The guide plate (27) is located at the upper end of the ejection plate (23), and the middle mold II (26) is located at the upper end of the guide plate (27). The guide rod (24) passes through the ejection plate (23), the guide plate (27), and the middle mold II (26). The ejection block (21) is located at the top of the guide rod (24) and at the center of the middle mold II (22).

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